linux cloning & imaging

First method:

sudo dd if=/dev/sda of=/dev/sdb status=progress

This will copy the entire drive to a compressed image file.

# dd if=/dev/sda ibs=4096 | gzip > partition.image.gz conv=noerror

If you want to restore the drive in the future you would use this:

# dd if=partition.image.gz | gunzip | dd of=/dev/sdba

Second method:

Open Gparted-GUI, choose copy partition, select target drive & Device — Create partition table.